George Bird Grinnell 
Jack in the Rockies 
A Boy’s Adventures with a Pack Train

George Bird Grinnell was an important figure in the early conservation movement and played a key role in establishing a number of national parks in the U.S. His love of nature shines through in the "Jack" series of action-adventure novels geared for younger audiences, including this volume, in which intrepid adventurer Jack Danvers participates in a pioneer pack train.